Welcome to TOVAS, a member of the Giovanni
(GES-DISC (Goddard Earth Sciences Data and Information Services Center) Interactive Online Visualization ANd aNalysis Infrastructure) family, which provides users with an easy-to-use, Web-based interface for the visualization and analysis of global precipitation data. See the FAQ
for further usage on this tool.
Note: If you used the previous version of TOVAS, please read the following important changes:
1) The way to obtain a map for precipitation accumulated over a period has been changed in the new TOVAS. To obtain such map, select "accumulated_precipitation" from the parameter list and "Lat-Lon map, Time-accumulated" from "Select Visualization."
2) The "Lat-Lon map, Time accumulated" service is intended only for this parameter, "accumulated precipitation" or the like. Using it for other parameters may not make physical sense.
3) New output formats: HDF, NetCDF, ASCII, and Google Earth KMZ.
(*See Below for TMPA Subset ASCII Service)
Giovanni-4 Now Available: New! Please try out Giovanni-4, the next generation of Giovanni, with dramatically improved performance and interactive plotting and mapping.
Near-Real-Time Monitoring Product (For research, use Archive Data)
Satellite Rainfall Archives
Ground Observation Archives
Rainfall Product Intercomparison
TMPA Subset ASCII Service
If you are interested in subsetting and converting to ASCII the TMPA data, we have developed a new service that allows you to accomplish this through a URL call. Below is a sample of a URL and the required inputs:
Here are the acceptable inputs:
TIME=STARTTIME%2FENDTIME (please retain the same format of YYYY-MM-DDTHH:MM:SS)
FLAGS=Product_version,Plot type (plot type is ‘Area’ or ‘Time’, see next line for acceptable Product_version)
SHORTNAME=Product_version (acceptable values are the following: 3B42RT_V7, 3B42RT_Daily, 3B42_V6_Daily, 3B42_V6, 3B43_V6, 3B42_V7, 3B42_V7_Daily, 3B43_V7)
VARIABLES=variable (acceptable values is ‘Rain’ or ‘AccRain’)
Continued improvement of this online tool, and the production and dissemination of these data sets, depends on your (our users) informing us on how you have used this tool and these data. We are particularly interested in the value of this tool and these data sets to your research. Please send your comments to firstname.lastname@example.org.
Acker, J. G. and G. Leptoukh (2007). Online analysis enhances use of NASA earth science data. Eos, Trans., Amer. Geophysical Union, 88 (2),14, 17.
Berrick, S.W., G. Leptoukh, J.D. Farley, and H. Rui. (2009). Giovanni: A Web service workflow-based data visualization and analysis system. IEEE Trans. Geosci. Remote Sens., 47(1), 106-113.
Liu, Z., H. Rui, W. Teng, L.S. Chiu, G. Leptoukh, and G. Vicente. (2007). Online visualization and analysis: A new avenue to use satellite data for weather, climate and interdisciplinary research and applications. Measuring Precipitation from Space - EURAINSAT and the future, Advances in Global Change Research, 28, 549-558.
Liu, Z., D. Ostrenga, W. Teng, and S. Kempler. (2012) Tropical Rainfall Measuring Mission (TRMM) Precipitation Data and Services for Research and Applications. Bulletin of the American Meteorological Society, doi: http://dx.doi.org/10.1175/BAMS-D-11-00152.1
Liu, Z., D. Ostrenga, W. Teng, S. Kempler, and L. Milich (2014), Developing GIOVANNI-based online prototypes to intercompare TRMM-related global gridded-precipitation products, Computers & Geosciences, in press, online version.
Please visit our other Giovanni Websites at the GES DISC:
Hurricane Data Analysis Tool (HDAT) :